Hm, so it’s a cascade of bones, flowing down a staircase. Some strange Mesoamerican thing? Wait, the photo credits say:
“Cover art is from First People in a New World: Colonizing Ice Age America by David J. Meltzer.”
Ice age? Okay, so pre-architecture, probably megafaunal…yes, those are pedestalled bones. Were they once in a pit or were they in a pile? Who knows, because now they’re on a staircase made by archaeologists.